Pixel parallel localized driver design for a 128 x 256 pixel array 3D 1Gfps image sensor

C. Zhang; V. T. S. Dao; T. G. Etoh; E. Charbon

doi:10.1117/12.2268877

20 February 2017 Pixel parallel localized driver design for a 128 x 256 pixel array 3D 1Gfps image sensor

C. Zhang, V. T. S. Dao, T. G. Etoh, E. Charbon

Proceedings Volume 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics; 1032807 (2017) https://doi.org/10.1117/12.2268877
Event: 31st International Congress on High-Speed Imaging and Photonics, 2016, Osaka, Japan

Abstract

In this paper, a 3D 1Gfps BSI image sensor is proposed, where 128 × 256 pixels are located in the top-tier chip and a 32 × 32 localized driver array in the bottom-tier chip. Pixels are designed with Multiple Collection Gates (MCG), which collects photons selectively with different collection gates being active at intervals of 1ns to achieve 1Gfps. For the drivers, a global PLL is designed, which consists of a ring oscillator with 6-stage current starved differential inverters, achieving a wide frequency tuning range from 40MHz to 360MHz (20ps rms jitter). The drivers are the replicas of the ring oscillator that operates within a PLL. Together with level shifters and XNOR gates, continuous 3.3V pulses are generated with desired pulse width, which is 1/12 of the PLL clock period. The driver array is activated by a START signal, which propagates through a highly balanced clock tree, to activate all the pixels at the same time with virtually negligible skew.

Citation Download Citation

C. Zhang, V. T. S. Dao, T. G. Etoh, and E. Charbon "Pixel parallel localized driver design for a 128 x 256 pixel array 3D 1Gfps image sensor", Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 1032807 (20 February 2017); https://doi.org/10.1117/12.2268877

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